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ADL5201 or ADL5202 in cascade configuration

Question asked by arvabj on Jun 6, 2017
Latest reply on Jun 21, 2017 by JinoL

Re-posting the same question as there was no response.

 

For our receiver design, we needed high gain amplifiers and wide range of gain control in the Intermediate Frequency (IF) section. Our IF frequency is 21MHz and we need >60dB gain control range. I was thinking of two possible combinations:

 

1. Use two ADL5201 in cascade. I can get 63dB gain control range with up to 40dB of maximum gain

2. Use the ADL5201 instead and connect them back to back.

 

Looks like the input and output impedance of the ADL5201/5202 are the same at 150 Ohms. So i do not need an extensive match circuit between the amplifiers, if they are in cascade. I was hoping to use the schematic attached. We need 50 Ohm input and output impedance for the IF section. So we plan to use the input/ output 1:3 transformers.

 

Are there any issues in using this part in the configuration shown in the attached schematic ? Is there a preference in ADL5201 or ADL5202 in this configuration ? We were hoping to use the ADL5202 to reduce chip count.

 

Thanks,

AB

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